Grundfos SMART Digital XL DDA 120-7, Инструкция по установке и эксплуатации

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Disch. valve leak
(Warning)
• Leaky/dirty outlet valve. Dosing
medium flows back from the outlet
line into the dosing head which
reduces the target flow.
• Check valve and tighten it up. Replace
valve if necessary. See section
8.4 Perform service .
• Flush system.
• Check O-ring position.
• Install strainer in inlet line.
• Install spring-loaded valve on the outlet
side.
Overload
(Alarm)
• Backpressure exceeds max.
operating pressure
• Reduce backpressure. Observe section
4.1 Technical data .
• Outlet valve blocked
• Isolating valve in outlet line closed • Replace valve if necessary. See section
8.4 Perform service .
• Check flow direction of valves (arrow) and
correct if necessary.
• Open the isolating valve (on the outlet
side).
• Pressure peaks • Enlarge diameter of outlet line.
• Install a pulsation damper in the outlet line
close to the outlet valve.
• Ambient temperature below
specified minimum value. See
section
4.1 Technical data .
• Adjust ambient temperature to specified
value.
Pressure sensor
(Warning)
• Broken "
FlowControl
" cable or
sensor (see fig. 13 )
• Check plug connection.
• Replace dosing head with sensor if
necessary.
• If the "Flow control" connection at the
pump is damaged, send the pump for
repair. See section
8.7 Repairs .
Motor blocked
(Alarm)
• Backpressure greater than
nominal pressure
• Reduce backpressure.
• Incorrectly installed diaphragm • Install the diaphragm correctly.
• Damage to gears
• Hall sensor failure
• Motor failure • Contact your Grundfos service partner.
Bus error
(Alarm)
• Fieldbus communication error • Check cables for correct specification and
damage; replace if necessary.
• Check cable routing and shielding; correct
if necessary.
CIU
(Alarm)
• CIU connection error • Check plug connection.
• Faulty CIU • Replace CIU if necessary.
Sensor signal
(Alarm)
• Sensor signal out of range 0/4-20
mA
• Check cable/plug connections and
replace, if necessary.
• Check signal transmitter.
Stop after power
failure
(Alarm)
• Function "
Stop after power failure
"
is enabled and power supply was
switched on or reestablished after
power failure.
• Check power supply and mains cable.
• Read section
7.7
Stop after power failure
.
Diaphragm leak.
(Alarm)
• Diaphragm leakage • Read section 8.6 Diaphragm leakage
• Change the diaphragm. See section
8.4 Perform service .
Display in the
"
Alarm
" menu
Possible cause Possible remedy